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authorZach Prezkuta <fermion@gmx.com>2012-06-09 13:54:21 -0600
committerZach Prezkuta <fermion@gmx.com>2012-06-16 10:25:32 -0600
commit09eb52810bbae39ba84b869d753ea2a062423b3a (patch)
treefb314949c0c2ed456a9a9f8e4e4c84f64d31fd2e
parent4faf0e609fe03095069c7a4bcdfc3496e4a28627 (diff)
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update signature checking for relayables
-rwxr-xr-xinclude/diaspora.php191
1 files changed, 122 insertions, 69 deletions
diff --git a/include/diaspora.php b/include/diaspora.php
index 1e6662f04..e91ebf442 100755
--- a/include/diaspora.php
+++ b/include/diaspora.php
@@ -1060,39 +1060,59 @@ function diaspora_comment($importer,$xml,$msg) {
}
$parent_item = $r[0];
- $author_signed_data = $guid . ';' . $parent_guid . ';' . $text . ';' . $diaspora_handle;
- $author_signature = base64_decode($author_signature);
+ /* How Diaspora performs comment signature checking:
- if(strcasecmp($diaspora_handle,$msg['author']) == 0) {
- $person = $contact;
- $key = $msg['key'];
- }
- else {
- $person = find_diaspora_person_by_handle($diaspora_handle);
+ - If an item has been sent by the comment author to the top-level post owner to relay on
+ to the rest of the contacts on the top-level post, the top-level post owner should check
+ the author_signature, then create a parent_author_signature before relaying the comment on
+ - If an item has been relayed on by the top-level post owner, the contacts who receive it
+ check only the parent_author_signature. Basically, they trust that the top-level post
+ owner has already verified the authenticity of anything he/she sends out
+ - In either case, the signature that get checked is the signature created by the person
+ who sent the salmon
+ */
- if(is_array($person) && x($person,'pubkey'))
- $key = $person['pubkey'];
- else {
- logger('diaspora_comment: unable to find author details');
+ $signed_data = $guid . ';' . $parent_guid . ';' . $text . ';' . $diaspora_handle;
+ $key = $msg['key'];
+
+ if($parent_author_signature) {
+ // If a parent_author_signature exists, then we've received the comment
+ // relayed from the top-level post owner. There's no need to check the
+ // author_signature if the parent_author_signature is valid
+
+ $parent_author_signature = base64_decode($parent_author_signature);
+
+ if(! rsa_verify($signed_data,$parent_author_signature,$key,'sha256')) {
+ logger('diaspora_comment: top-level owner verification failed.');
return;
}
}
+ else {
+ // If there's no parent_author_signature, then we've received the comment
+ // from the comment creator. In that case, the person is commenting on
+ // our post, so he/she must be a contact of ours and his/her public key
+ // should be in $msg['key']
- if(! rsa_verify($author_signed_data,$author_signature,$key,'sha256')) {
- logger('diaspora_comment: verification failed.');
- return;
- }
-
- if($parent_author_signature) {
- $owner_signed_data = $guid . ';' . $parent_guid . ';' . $text . ';' . $diaspora_handle;
+/* if(strcasecmp($diaspora_handle,$msg['author']) == 0) {
+ $person = $contact;
+ $key = $msg['key'];
+ }
+ else {
+ $person = find_diaspora_person_by_handle($diaspora_handle);
- $parent_author_signature = base64_decode($parent_author_signature);
+ if(is_array($person) && x($person,'pubkey'))
+ $key = $person['pubkey'];
+ else {
+ logger('diaspora_comment: unable to find author details');
+ return;
+ }
+ }*/
- $key = $msg['key'];
+ $author_signature = base64_decode($author_signature);
- if(! rsa_verify($owner_signed_data,$parent_author_signature,$key,'sha256')) {
- logger('diaspora_comment: owner verification failed.');
+ if(! rsa_verify($signed_data,$author_signature,$key,'sha256')) {
+ logger('diaspora_comment: comment author verification failed.');
return;
}
}
@@ -1613,7 +1633,7 @@ function diaspora_like($importer,$xml,$msg) {
intval($r[0]['id']),
intval($importer['uid'])
);*/
- // FIXME
+ // FIXME--actually don't unless it turns out that Diaspora does indeed send out "false" likes
// send notification via proc_run()
return;
}
@@ -1626,39 +1646,58 @@ function diaspora_like($importer,$xml,$msg) {
return;
}
- $signed_data = $guid . ';' . $target_type . ';' . $parent_guid . ';' . $positive . ';' . $diaspora_handle;
- $author_signature = base64_decode($author_signature);
+ /* How Diaspora performs "like" signature checking:
- if(strcasecmp($diaspora_handle,$msg['author']) == 0) {
- $person = $contact;
- $key = $msg['key'];
- }
- else {
- $person = find_diaspora_person_by_handle($diaspora_handle);
- if(is_array($person) && x($person,'pubkey'))
- $key = $person['pubkey'];
- else {
- logger('diaspora_like: unable to find author details');
- return;
- }
- }
+ - If an item has been sent by the like author to the top-level post owner to relay on
+ to the rest of the contacts on the top-level post, the top-level post owner should check
+ the author_signature, then create a parent_author_signature before relaying the like on
+ - If an item has been relayed on by the top-level post owner, the contacts who receive it
+ check only the parent_author_signature. Basically, they trust that the top-level post
+ owner has already verified the authenticity of anything he/she sends out
+ - In either case, the signature that get checked is the signature created by the person
+ who sent the salmon
+ */
- if(! rsa_verify($signed_data,$author_signature,$key,'sha256')) {
- logger('diaspora_like: verification failed.');
- return;
- }
+ $signed_data = $guid . ';' . $target_type . ';' . $parent_guid . ';' . $positive . ';' . $diaspora_handle;
+ $key = $msg['key'];
if($parent_author_signature) {
-
- //$owner_signed_data = $guid . ';' . $target_type . ';' . $parent_guid . ';' . $positive . ';' . $diaspora_handle;
+ // If a parent_author_signature exists, then we've received the like
+ // relayed from the top-level post owner. There's no need to check the
+ // author_signature if the parent_author_signature is valid
$parent_author_signature = base64_decode($parent_author_signature);
- $key = $msg['key'];
-
if(! rsa_verify($signed_data,$parent_author_signature,$key,'sha256')) {
- logger('diaspora_like: owner verification failed.');
+ logger('diaspora_like: top-level owner verification failed.');
+ return;
+ }
+ }
+ else {
+ // If there's no parent_author_signature, then we've received the like
+ // from the like creator. In that case, the person is "like"ing
+ // our post, so he/she must be a contact of ours and his/her public key
+ // should be in $msg['key']
+
+/* if(strcasecmp($diaspora_handle,$msg['author']) == 0) {
+ $person = $contact;
+ $key = $msg['key'];
+ }
+ else {
+ $person = find_diaspora_person_by_handle($diaspora_handle);
+ if(is_array($person) && x($person,'pubkey'))
+ $key = $person['pubkey'];
+ else {
+ logger('diaspora_like: unable to find author details');
+ return;
+ }
+ }*/
+
+ $author_signature = base64_decode($author_signature);
+
+ if(! rsa_verify($signed_data,$author_signature,$key,'sha256')) {
+ logger('diaspora_like: like creator verification failed.');
return;
}
}
@@ -1802,39 +1841,53 @@ function diaspora_signed_retraction($importer,$xml,$msg) {
$signed_data = $guid . ';' . $type ;
+ $key = $msg['key'];
- $sig_decode = base64_decode($sig);
+ /* How Diaspora performs relayable_retraction signature checking:
- if(strcasecmp($diaspora_handle,$msg['author']) == 0) {
- $person = $contact;
- $key = $msg['key'];
- }
- else {
- $person = find_diaspora_person_by_handle($diaspora_handle);
+ - If an item has been sent by the item author to the top-level post owner to relay on
+ to the rest of the contacts on the top-level post, the top-level post owner checks
+ the author_signature, then creates a parent_author_signature before relaying the item on
+ - If an item has been relayed on by the top-level post owner, the contacts who receive it
+ check only the parent_author_signature. Basically, they trust that the top-level post
+ owner has already verified the authenticity of anything he/she sends out
+ - In either case, the signature that get checked is the signature created by the person
+ who sent the salmon
+ */
- if(is_array($person) && x($person,'pubkey'))
- $key = $person['pubkey'];
- else {
- logger('diaspora_signed_retraction: unable to find author details');
+ if($parent_author_signature) {
+
+ $parent_author_signature = base64_decode($parent_author_signature);
+
+ if(! rsa_verify($signed_data,$parent_author_signature,$key,'sha256')) {
+ logger('diaspora_signed_retraction: top-level post owner verification failed');
return;
}
- }
- if(! rsa_verify($signed_data,$sig_decode,$key,'sha256')) {
- logger('diaspora_signed_retraction: retraction-owner verification failed.' . print_r($msg,true));
- return;
}
+ else {
- if($parent_author_signature) {
- $parent_author_signature = base64_decode($parent_author_signature);
+/* if(strcasecmp($diaspora_handle,$msg['author']) == 0) {
+ $person = $contact;
+ $key = $msg['key'];
+ }
+ else {
+ $person = find_diaspora_person_by_handle($diaspora_handle);
- $key = $msg['key'];
+ if(is_array($person) && x($person,'pubkey'))
+ $key = $person['pubkey'];
+ else {
+ logger('diaspora_signed_retraction: unable to find author details');
+ return;
+ }
+ }*/
- if(! rsa_verify($signed_data,$parent_author_signature,$key,'sha256')) {
- logger('diaspora_signed_retraction: failed to verify person relaying the retraction (e.g. owner of a post relaying a retracted comment');
+ $sig_decode = base64_decode($sig);
+
+ if(! rsa_verify($signed_data,$sig_decode,$key,'sha256')) {
+ logger('diaspora_signed_retraction: retraction owner verification failed.' . print_r($msg,true));
return;
}
-
}
if($type === 'StatusMessage' || $type === 'Comment' || $type === 'Like') {